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Speed Sensor Circuit

WARNING: This page is about a different car, the 2003 Lexus GS 430, 2003 Lexus GS 300, 2002 Lexus GS 430, and 2002 Lexus GS 300. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: If not using the hand-held tester, begin with step  3.
    CAUTION: Be sure to safely route all the cables when driving with the tester connected to the vehicle (i.e. keep cables away from feet, pedals, steering wheel and shift lever).
  1. Check the speedometer value. Connect the hand-held tester to DLC3. See Figure. Turn the ignition switch ON and hand-held tester main switch ON. Select the DATA LIST mode on the hand-held tester. When driving the vehicle, check that the parameter value of the speedometer changes on the screen of the hand-held tester. If the speed displayed on the screen of the tester changes as the vehicle speed changes, replace the combination meter. See INSTRUMENT PANEL  under REMOVAL & INSTALLATION. If the results are not as described above, go to the next step.
  2. Check the harness and connector between combination meter and ABS ECU. If the results are OK, check the speed sensor circuit and ABS ECU. See appropriate ANTI-LOCK/VEHICLE SKID CONTROL - GS300 & GS430 article in BRAKES. If the results are not good, repair or replace the harness or connector.
  3. Check DTC P0500: VEHICLE SPEED SENSOR (VSS) MALFUNCTION. For 2002 models, see DTC P0500: VEHICLE SPEED SENSOR (VSS) MALFUNCTION under DIAGNOSTIC TESTS under SELF-DIAGNOSTICS - GS300 or SELF-DIAGNOSTICS - GS430 article in ENGINE PERFORMANCE. For 2003 models, see DTC P0500: VEHICLE SPEED SENSOR (VSS) MALFUNCTION under DIAGNOSTIC TESTS under SELF-DIAGNOSTICS - GS300 or SELF-DIAGNOSTICS - GS430 article in ENGINE PERFORMANCE. If the results are OK, replace the combination meter. See INSTRUMENT PANEL  under REMOVAL & INSTALLATION. If the results are not good, go to the next step.
  4. Check the harness and connector between combination meter and ABS ECU. If the results are OK, check the speed sensor circuit and ABS ECU. See appropriate ANTI-LOCK - GS300 & GS430 article in BRAKES. If the results are not good, repair or replace the harness or connector.
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